llvm-6502

mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-01-25 00:33:15 +00:00

History

Chris Lattner 5d52135a14 Upgrade the ugly darwin 64-bit bswap idiom (bswap %eax / bswap %edx /

xchgl %eax, %edx) to llvm.bswap.i64.  This compiles:

long long test2(long long A) {
  return _OSSwapInt64(A);
}

to:

_test2:
        movl 8(%esp), %eax
        movl 4(%esp), %edx
        bswapl %eax
        bswapl %edx
        ret

instead of:

_test2:
        movl 8(%esp), %edx
        movl 4(%esp), %eax
        bswap   %eax
        bswap   %edx
        xchgl   %eax, %edx
        ret

GCC manages (with -fomit-frame-pointer) the uglier:

_test2:
        subl    $4, %esp
        movl    8(%esp), %eax
        movl    12(%esp), %edx
        bswap   %eax
        bswap   %edx
        xchgl   %eax, %edx
        addl    $4, %esp
        ret


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@32001 91177308-0d34-0410-b5e6-96231b3b80d8

2006-11-29 01:48:01 +00:00

Analysis

WTF? These weird newlines got in there...

2006-11-29 01:14:00 +00:00